P3 International Kill A Watt

I have used this device for a couple years now - helps me determine what actual power usage is from various devices and appliances around my home.  I mainly use the "watts" and "Kilowat Hours/Clock" features.  Easy to use.  Small to store.  It allows for quick tests for vampire and other loads, or you can leave it plugged in - to a refrigerator, for example - for a week or month.

I tested my fridges for a full month to get the various usage and power cycle loads captured over time - was very VERY handy for that. 

Love it!!!

The main reason that Prius drivers get such good mileage is arguably not because they are such efficient cars, but that the real-time feedback of mileage makes drivers radically change their behavior.  Enter the Kill-A-Watt.  I bought one for my residential energy audit company last year and use it every time I go on site.  I basically plug an appliance into the device, get a readout, and take a picture.  This seals the number and appliance's energy usage into the customer's brain.  From then on out they know exactly how much power it uses.  It can really change the way people act in a very concrete way.  Buy it for your own home for a similar revelation.

This is a very useful product, which can help reduce your power consumption by determining how much power each electrical device/appliance you have uses.

The two primary modes of operation are: 1) Watts, where you can measure instantaneous power consumption, and: 2) Kilowatt-hours, where you can determine average power consumption over extended time periods.  The first mode is more effective for devices that use the same amount of power all the time (like a light bulb), the second mode is more effective for devices that vary their power consumption over time (like a refrigerator).

My one complaint would be that it seems to read low by one watt (approximately).